EP2574144B1 - Verfahren zum Beheizen eines Kochgefäßes mittels einer Induktionsheizeinrichtung und Induktionsheizeinrichtung - Google Patents

Verfahren zum Beheizen eines Kochgefäßes mittels einer Induktionsheizeinrichtung und Induktionsheizeinrichtung Download PDF

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Publication number
EP2574144B1
EP2574144B1 EP12185392.3A EP12185392A EP2574144B1 EP 2574144 B1 EP2574144 B1 EP 2574144B1 EP 12185392 A EP12185392 A EP 12185392A EP 2574144 B1 EP2574144 B1 EP 2574144B1
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EP
European Patent Office
Prior art keywords
cooking vessel
induction heating
resonant circuit
parameter value
energy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12185392.3A
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German (de)
English (en)
French (fr)
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EP2574144A2 (de
EP2574144A3 (de
Inventor
Wilfried Schilling
Christian Egenter
Werner Kappes
Stefan Westrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
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Priority to PL12185392T priority Critical patent/PL2574144T3/pl
Publication of EP2574144A2 publication Critical patent/EP2574144A2/de
Publication of EP2574144A3 publication Critical patent/EP2574144A3/de
Application granted granted Critical
Publication of EP2574144B1 publication Critical patent/EP2574144B1/de
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to a method for heating a cooking vessel by means of an induction heater and an induction heater for performing the method.
  • In Indutationsloom acquired an alternating magnetic field is generated by means of an induction heating, which induces eddy currents in a heated cooking vessel with a bottom of ferromagnetic material and causes loss of magnetization, whereby the cooking vessel is heated.
  • the induction heating coil is part of a resonant circuit comprising the induction heating coil and one or more capacitors.
  • the induction heating coil is usually designed as a flat, spirally wound coil with associated ferrite cores and arranged, for example, under a glass ceramic surface of an induction hob.
  • the induction heating coil forms an inductive and a resistive part of the resonant circuit in conjunction with the cookware to be heated.
  • a low-frequency AC mains voltage is first rectified with a mains frequency of, for example, 50 Hz or 60 Hz and then converted by means of semiconductor switches into an excitation or drive signal of higher frequency.
  • the excitation signal or the drive voltage is usually a square-wave voltage with a frequency in a range from 20 kHz to 50 kHz.
  • a circuit for generating the excitation signal is also referred to as a (frequency) converter.
  • a frequency of the excitation signal or of the rectangular voltage is changed as a function of the heat output to be delivered or fed in or of the desired power consumption.
  • This method for adjusting the heating power output makes use of the fact that with a stimulation of the resonant circuit with its resonant frequency, a maximum heat output occurs. The greater the difference between the frequency of the excitation signal and the resonant frequency of the resonant circuit, the smaller the output of heating power.
  • the induction heating device has a plurality of oscillation circuits, for example, if the induction heating device forms an induction hob with different induction cookers and different heating powers are set for the oscillating circuits, beats may be caused by superimposing the different frequencies of the excitation signals, which may lead to disturbing noises.
  • a method for heating power adjustment which avoids noise due to such beats, is a pulse width modulation of the excitation signal at constant excitation frequency, in which an effective value of a heating power is adjusted by changing the pulse width of the excitation signal.
  • RMS control by changing the pulse width at a constant excitation frequency, however, high on and off currents in the semiconductor switches, whereby a broadband and high-energy interference spectrum is caused.
  • the DE 10 2009 047 185 A1 discloses a method and an induction heater in which temperature dependent ferromagnetic properties of the cooking vessel bottom are measured at high resolution and evaluated to determine the temperature of the cooking vessel bottom.
  • the DE 102 31 122 A1 shows a method for measuring the temperature of a metallic cooking vessel, wherein at a boiling point, a resonant circuit parameter can be detected, which is used as a setpoint for a control.
  • the DE 102 53 198 A1 shows a method for thermally monitoring an inductively heatable cooking vessel by evaluating a frequency of an inductive heating causing AC, such boiling is detected.
  • the WO 2007/124008 A2 and the WO 2010/080738 A1 each show cooking process in which a given amount of energy is fed into a cooking vessel. After feeding the predetermined amount of energy, a respective cooking process is terminated.
  • the invention has for its object to provide a method for heating a cooking vessel by means of an induction heater and an induction heater for performing the method, which, in particular based on the in the DE 10 2009 047 185 A1 revealed measuring principle, a temperature-controlled or temperature-controlled cooking allow.
  • the invention achieves this object by a method having the features of claim 1 and an induction heater having the features of claim 7.
  • the method according to the invention serves for heating a cooking vessel, in particular in the form of a (frying) pan, by means of an induction heating device, wherein the induction heating device comprises a resonant circuit with an induction heating coil.
  • the method comprises the following steps: feeding a predetermined amount of energy into the cooking vessel by means of the induction heater as a function of a selected by a user Schuzzisshake and / or of a user selected cooking vessel type, then determining and storing a self-adjusting parameter value of the resonant circuit, in particular one Self-resonant frequency of the resonant circuit or belonging to the natural resonant frequency period which is dependent on a temperature of the cooking vessel, in particular the cooking vessel bottom, and controlling the at least one parameter value to a desired value, which depends on the stored parameter value.
  • the setpoint value of the parameter value is equal to the stored parameter value.
  • a signal is output to a user after feeding the predetermined amount of energy into the cooking vessel.
  • the cooking vessel is subjected to a predetermined heating power for a predetermined settling time.
  • the settling time is selected between one second and 10 seconds, preferably equal to 5 seconds
  • the predetermined heating power is selected between 10% and 50%, preferably equal to 25%, of a rated heating power.
  • the induction heater includes: an oscillation circuit having an induction heating coil, means for measuring the input energy, and a controller configured to perform the above-mentioned method.
  • Fig. 1 schematically shows an induction heater 9 with a resonant circuit 4, which has a Indu mecanicsmosspule 1 and capacitors 2 and 3, a power section 7 controlled by a control device 8 conventionally rectified a low-frequency mains AC voltage UN with a mains frequency of 50Hz, for example, and then by means not shown semiconductor switches in converts a square-wave voltage UR with a frequency in a range from 20 kHz to 50 kHz, the resonant circuit 4 or its induction heating coil 1 being supplied with the square-wave voltage UR in order to feed heating power into a ferromagnetic bottom of a cooking vessel 5, and a device 10 for measuring the energy fed into the cooking vessel 5.
  • the capacitors 2 and 3 are conventionally looped in series between poles UZK + and UZK- an intermediate circuit voltage, wherein a connection node of the capacitors 2 and 3 is connected to a terminal of the induction heating coil 1.
  • the induction heating device 9 has measuring means (not shown in greater detail) which provide a continuous or periodic determination of a parameter value of the oscillating circuit 4 in the form of a period Tp (see FIG Fig. 2 ) allow a self-resonant oscillation of the resonant circuit 4, wherein the period Tp of the temperature of the cooking vessel bottom is dependent, ie with increasing temperature also increases, as the temperature of the cooking vessel bottom, the effective inductance increases, so that the resonant frequency decreases and correspondingly increases the period.
  • the period Tp can be determined, for example, by means of a timer of a microcontroller.
  • the measuring method and the heating power setting is also on the DE 10 2009 047 185 A1 Reference is hereby made to the content of the description to avoid repetition.
  • Fig. 2 shows time courses of a temperature ⁇ of the pot bottom 5, by means of in Fig. 1 shown induction heating device 9 is heated, a fed into the cooking vessel 5 by means of the induction heater heating power P (in 0.5% of a rated heat output) and the period Tp an intrinsically resonant oscillation of the resonant circuit 4 in an implementation of the method.
  • the control device 8 continuously determines periodically the period Tp of a self-resonant oscillation of the resonant circuit 4, for which purpose the heating power supply is temporarily interrupted and switched over to self-resonant operation of the resonant circuit 4. Due to the low temporal resolution, these phases are in Fig. 2 not shown.
  • the oscillating circuit 4 is supplied with the high-frequency square-wave voltage UR with a maximum heating power setpoint (corresponding to 100% of a nominal heating power) until, determined by the device 10, a predetermined amount of energy is fed into the cooking vessel 5 by means of the induction heating device 9, wherein the predetermined amount of energy may be dependent upon a user selected heating power level and / or on a cooking vessel type selected by the user.
  • a settling interval II follows, during which the cooking vessel 5 is charged with about 25% of the rated heating power for 5 seconds.
  • the instantaneous period Tp is determined and stored as the setpoint PM.
  • duration Tp is controlled to the stored setpoint PM.
  • the heating of cooking vessels, such as frying pans, to a suitable operating temperature according to the invention is energy controlled.
  • the amount of energy given by harness mass, heat capacity, end temperature, and heat loss may be determined experimentally, stored, and re-supplied to reproduce the desired operating temperature.
  • the cooking system per cooking zone, the means 10 for measuring the energy supplied.
  • the cooking system provides a range of preferably 9 graded amounts of heating energy, graded so that both light and heavy frying pans can be heated to a working temperature between 140 ° C and 210 ° C.
  • a user typically uses only a few different types of pans and thus can quickly learn which level is best for which pan.
  • the current temperature value or a variable representative thereof is measured inductively and used as a reference variable for an (indirect) temperature control.
  • the current temperature value or a variable representative thereof is measured inductively and used as a reference variable for an (indirect) temperature control.
  • the user may be presented with different pans, with the user selecting the pans most similar or identical to them, and additionally the one desired Temperature enters. From this, the system can then derive the required heating energy.
  • the achievement of the desired frying temperature is reported to the user by an audible and / or visual signal.
  • An addition of a food in the cooking vessel 5 can be quickly recognized due to a change in the period Tp and compensated by increasing the heating power, as for example Fig. 2 at the beginning of the time interval III.
  • the addition of a steak here leads to a reduction in the temperature ⁇ or the period TP, which is compensated accordingly.
  • parameter value of the resonant circuit in the form of the period duration, for example an amplitude of a resonant circuit voltage, a voltage across the induction heating coil, an amplitude of a resonant circuit current and / or a phase shift between the resonant circuit voltage and the resonant circuit current ,
  • the invention may also find application in the context of a parallel resonant circuit or a series resonant circuit with full bridge drive.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Cookers (AREA)
  • General Induction Heating (AREA)
EP12185392.3A 2011-09-26 2012-09-21 Verfahren zum Beheizen eines Kochgefäßes mittels einer Induktionsheizeinrichtung und Induktionsheizeinrichtung Active EP2574144B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12185392T PL2574144T3 (pl) 2011-09-26 2012-09-21 Sposób ogrzewania naczynia do gotowania za pomocą indukcyjnego urządzenia grzejnego i indukcyjne urządzenie grzejne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011083386A DE102011083386A1 (de) 2011-09-26 2011-09-26 Verfahren zum Beheizen eines Kochgefäßes mittels einer Induktionsheizeinrichtung und Induktionsheizeinrichtung

Publications (3)

Publication Number Publication Date
EP2574144A2 EP2574144A2 (de) 2013-03-27
EP2574144A3 EP2574144A3 (de) 2013-07-17
EP2574144B1 true EP2574144B1 (de) 2016-12-21

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EP12185392.3A Active EP2574144B1 (de) 2011-09-26 2012-09-21 Verfahren zum Beheizen eines Kochgefäßes mittels einer Induktionsheizeinrichtung und Induktionsheizeinrichtung

Country Status (7)

Country Link
US (1) US9554424B2 (es)
EP (1) EP2574144B1 (es)
JP (1) JP2013073939A (es)
CN (1) CN103068086B (es)
DE (1) DE102011083386A1 (es)
ES (1) ES2616103T3 (es)
PL (1) PL2574144T3 (es)

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PL2753202T3 (pl) 2011-09-06 2016-11-30 Podgrzewanie materiału przeznaczonego do palenia
US11924930B2 (en) 2015-08-31 2024-03-05 Nicoventures Trading Limited Article for use with apparatus for heating smokable material
US20170055584A1 (en) 2015-08-31 2017-03-02 British American Tobacco (Investments) Limited Article for use with apparatus for heating smokable material
US20170119046A1 (en) 2015-10-30 2017-05-04 British American Tobacco (Investments) Limited Apparatus for Heating Smokable Material
EP3177107B1 (de) 2015-12-02 2024-01-24 E.G.O. Elektro-Gerätebau GmbH Verfahren zum betrieb eines induktionskochfelds
CN107436198B (zh) * 2016-05-27 2021-03-30 浙江绍兴苏泊尔生活电器有限公司 锅具温度检测系统、方法和电磁炉
EP3307018B1 (de) 2016-10-10 2019-03-27 E.G.O. ELEKTRO-GERÄTEBAU GmbH Verfahren zur steuerung eines induktionskochfeldes und induktionskochfeld
DE102016219590A1 (de) 2016-10-10 2018-04-12 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Betrieb eines Induktionskochfelds und Induktionskochfeld
DE102016222313B4 (de) 2016-11-14 2021-08-12 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Kochen von mindestens einem Ei
GB201705206D0 (en) 2017-03-31 2017-05-17 British American Tobacco Investments Ltd Apparatus for a resonance circuit
DE102017210527B4 (de) 2017-06-22 2021-01-14 E.G.O. Elektro-Gerätebau GmbH Pumpe für ein Elektrogerät und Elektrogerät mit einer Fluidführung und einer solchen Pumpe
CN107990995A (zh) * 2017-12-06 2018-05-04 王宝彬 一种测量评估电磁锅锅体温度的方法
CN114424674B (zh) * 2019-09-30 2023-12-22 伊莱克斯家用电器股份公司 用于确定提供给感应加热元件的电流的特性的方法
CN112710412B (zh) * 2019-10-25 2023-11-03 佛山市顺德区美的电热电器制造有限公司 电磁加热设备及其锅具标定方法和装置
DE102022200998A1 (de) * 2022-01-31 2023-08-03 BORA - Vertriebs GmbH & Co KG Verfahren zur Steuerung einer Kochstelle

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WO2010080738A1 (en) * 2009-01-06 2010-07-15 Access Business Group International Llc Smart cookware

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Also Published As

Publication number Publication date
EP2574144A2 (de) 2013-03-27
US9554424B2 (en) 2017-01-24
US20130087553A1 (en) 2013-04-11
ES2616103T3 (es) 2017-06-09
DE102011083386A1 (de) 2013-03-28
CN103068086A (zh) 2013-04-24
JP2013073939A (ja) 2013-04-22
PL2574144T3 (pl) 2017-06-30
CN103068086B (zh) 2016-08-24
EP2574144A3 (de) 2013-07-17

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